service
был способ указания зависимостей контроллера. Загрузка зависимостей перенесена в ActiveSupport.
Из кода 1.2.0:
# Specifies a variable number of services that this controller depends on.
# Services are normally singletons or factories, like
# Action Mailer service or a Payment Gateway service.
def service(*services)
require_dependencies(:service, services)
depend_on(:service, services)
end
deprecate :service